CN1035470C - Cleaning of filters - Google Patents
Cleaning of filters Download PDFInfo
- Publication number
- CN1035470C CN1035470C CN94192231A CN94192231A CN1035470C CN 1035470 C CN1035470 C CN 1035470C CN 94192231 A CN94192231 A CN 94192231A CN 94192231 A CN94192231 A CN 94192231A CN 1035470 C CN1035470 C CN 1035470C
- Authority
- CN
- China
- Prior art keywords
- filter
- solvent
- washing
- heated
- spinning solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000005406 washing Methods 0.000 claims abstract description 34
- 239000002904 solvent Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000003303 reheating Methods 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 62
- 238000009987 spinning Methods 0.000 claims description 33
- 150000001412 amines Chemical class 0.000 claims description 22
- 239000000835 fiber Substances 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 6
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 6
- 229910052753 mercury Inorganic materials 0.000 claims description 6
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 238000007380 fibre production Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000003860 storage Methods 0.000 description 18
- 238000000197 pyrolysis Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000008676 import Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004506 ultrasonic cleaning Methods 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229920000433 Lyocell Polymers 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D41/00—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids
- B01D41/04—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids of rigid self-supporting filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
- B08B7/0071—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by heating
- B08B7/0085—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by heating by pyrolysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2220/00—Type of materials or objects being removed
- B08B2220/04—Polymers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Inorganic Fibers (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Filtering Materials (AREA)
- Carbon And Carbon Compounds (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
A method of cleaning metal filters of a solvent spun fibre production plant. The method comprises the step of (a) dissolving dope from the filters using a hot solvent for the dope, (b) washing the solvent from the filters using hot water, (c) pyrolysing remnants of dope or solvent in the filters, (d) ultrasonically washing the pyrolysed particles from the filters, (e) reheating the filters to dislodge pyrolysed particles, (f) ultrasonically rewashing the filters and (g) drying the filters.
Description
The present invention relates to be used for the filter of chemical process, relate to the cleaning method of the filter that the filtration spinning solution is used in the solvent spun fibre manufacture process particularly, and the equipment that cleans this filter.
Making solvent spun fibre, in the process of Tencel (trade mark of Courtaulds fiber company) cellulose fibre, is that the wood pulp that spinning solution promptly is dissolved in the amine oxide aqueous solution is flowed through a series of filters to many spinning heads under pressure with pump for example.Nozzle on each spinning head, its diameter only are 80 microns or littler usually.Therefore for avoiding any one nozzle blocked, the filtration of spinning solution is extremely important.
Such as those modern factories that the Courtaulds fiber company in AlabamaState,U.S.A Mobile city is set up, its design scale can be produced hundreds of tons of fibers continuously.To this class factory, flow to the spinning solution stream of spinning head nozzle, pause or change if having, must produce catastrophic consequence.Therefore very importantly, must use the very filter of cleaning, and the cleaning of filter must be thorough as best one can.
Target of the present invention just provides a method of thoroughly cleaning the spinning solution filter that solvent spun fibre manufactory uses, and the equipment of realizing the method.
A content of the present invention is to provide a cleaning method for the makers' spinning solution filter of solvent spun fibre.The step of the method is as follows:
(a) filter to be cleaned is assembled in a container, make the hot solvent of solubilized spinning solution flow through filter, spinning solution is wherein dissolved and washing filter;
(b) with the demineralized water washing filter of heat, from flush away solvent wherein;
(c) hot filtration apparatus residual spinning solution or temperature of solvent charing in being enough to filter under vacuum condition;
(d) supersound washing filter in the demineralized water of heat is from wherein removing the charing particle;
(e) filter is carried out drying.
Another content of the present invention is: afterwards filter is placed a stove in step (d), reheat to a predetermined temperature, cooling makes the charing particle that may still residue in the filter peel off then, supersound washing in demineralized water again makes the charing particle that peels off in above-mentioned hot again step remove.
When spinning solution was the aqueous solution of cellulose and amine oxide, the solvent that is used for step (a) was the amine oxide aqueous solution that is heated to 100 ° of-120 ℃ of temperature ranges.
Solvent preferably flows, makes then it to flow along a direction in filter interior round the outside of filter earlier.If desired, also can make again its in filter along flowing in the opposite direction with last side.
Each content of the present invention provide realize the equipment of solvent spun fibre manufactory with spinning solution filter cleaning method, this equipment comprise a washing container that filter to be washed is installed in it, make device that the filter interior of solvent in container optionally flow, with the device of demineralized water washing filter, can put into filter and order that filter residual spin liquid does not burn and charing filter is heated and the stove of vacuum-pumping, ultrasonic cleaning water-bath that washing filter is used, filter carried out the drying device of drying in reduced pressure.
This equipment also can further comprise again filter is heated the heater that the charing particle is peeled off.
Below in conjunction with accompanying drawing, only narrate embodiment of the present invention as an example.
Fig. 1 schematically illustrates the present invention with block diagram form and cleans the used equipment of solvent spun fibre manufacturing factory owner filter method.
Fig. 2 schematically represents to realize the used a kind of equipment of washing step in the inventive method.
Fig. 3 schematically represents to realize the used another kind of equipment of washing step in the inventive method.
In Fig. 3, each filter to be cleaned 10 is made up of a branch of tubular filter element 11, and this tube element is opening at one end, then seals at the other end.Tube element 11 has a cylindrical wall that is formed by two-layer sintered stainless steel fiber mat, and the effective aperture on the wall can the elimination granularity be the particle of 20 μ m.Tube element 11 is installed on the tube plate 12, and the latter then is contained in (not shown) in the filtering container of sealing when using in factory.The cylindrical wall that the spinning solution that filters sees through tubular element 11 inwardly flows in the tube chamber of respective element 11, leaves element 11 at its openend then.Therefore, when the wall of element 11 blocks and when needing to clean, its wall is just covered by spinning solution, spinning solution just condenses in the inside and outside of element 11 after cooling off.
Filter is taken out before the filtering container, wash away out from filter with a kind of inert gas such as nitrogen spinning solution earlier a part of (about 70%).Taking out filter then goes to clean.
In Fig. 1, (step 13) is to remove the main part of spinning solution through washing earlier for filter cell 11 to be cleaned.Then filter element is heated in stove 30, make residual spinning solution pyrolysis charring, filter element is inserted make the washing of charing particle remove (step 31) in the ultra sonic bath of thermal softening water afterwards.
And then the charing particle is peeled off with high pressure demineralized water spray filtering device element 11.After supersound washing step and water under high pressure spray step repeated repeatedly, each filter cell drying was again weighed.
Filter cell is reheated in stove 30, is not for pyrolysis specifically, but the charing particle is peeled off.And then filter cell is placed on relaunders (step 31) in the ultra sonic bath, dry in a common baking oven 32.Reheating step 30, washing step 31 and drying steps 32 can repeat repeatedly.
Fig. 2 and Fig. 3 have represented to be used for the two kinds of washing containers 13 of washing filter element and the details of servicing unit.
Earlier specifically see Fig. 2, still being contained in has the tubular filter that obstruction is arranged to be cleaned on its respective episode tube sheet 12, take out from fiber factory, now is installed in the sealable heated scrub container 13.
Heat (about 80 ℃) amine oxide aqueous solution (about 78 weight %) from a storage tank (not shown) is housed in the storage tank 9.With the demineralized water of heat with solution again towards rare to about 76 weight %.
This cleaning is carried out flow circuit with solution by pump 32, its path is to enter container 13 through the inlet 14 that is positioned at washing container 13 bottoms, flow through the exterior circumferential of element 11, leave container by 4 15 (only showing one of them among the figure) of outlet and valve 17 at last, flow back to storage tank 9 again.
When cleaning solution circulated under the effect of pump 32, the hot water jacket that this solution is positioned at around container 13 and storage tank 9 and the pipe-line system was heated to about 110 ℃.In case cleaning solution reaches 110 ℃ of operating temperatures, it just circulates and continues about 2 hours.Reduce the water leg temperature then, make solution be cooled to about 70 ℃.So this cleaning solution mat pump 32 is pumped to by storage tank 9 and re-uses after the storage tank (not shown) is provided with.
And then fresh amine oxide solution introduced storage tank 9, as mentioned above towards rare it.Import 14 circulations of the effect of the cleaning solution mat pump 32 that this is fresh by washing container 13 flow into containers, leave container by exporting 15 through valve 17 then.This solution mat container 13, storage tank 9 and pipe-line system water leg on every side once more is heated to 110 ℃.In case after cleaning solution reaches this operating temperature, valve 17 cuts out, force the inside of flow of solution through strainer elements 11, flow back to storage tank 9 through exporting 18 then.This flow circuit continued about 3 hours, then the water leg temperature was reduced, and made cleaning solution be cooled to about 70 ℃, then solution mat pump 32 was turned back in the storage tank for re-using through valve 19 pumpings again.
At last, with the amine oxide solution feeding storage tank 9 of the 3rd batch of heat, rare as preshoot.This solution mat pump 32 is once more crossed container 13 through inlet 13 and outlet 15 circular flows, returns storage tank 9.Equally the solution with water chuck is heated to 110 ℃.Solution remains on this temperature, circulates 3 hours.Solution is cooled to 70 ℃ then, storage tank is returned in pumping.After this washs end for the third time, open container 13, take out filter cell 11.
Also can take advantage of element 11 still in container 13, perhaps after container 13 takes out, with the demineralized water washing of heat, the amine oxide that flush away is appended.
In the another variant of above-mentioned cycles of washing, washing container 13 has the outlet 118 of inlet 114 and 115 (see figure 3)s and a band valve of two band valves.After cleaning solution as above dilutes, promptly as described belowly flow to a selected import 114 or 115 by pump 132.
Inlet 114 is linked to container 13 inside, a side of tube plate 12 by valve 116.The effect of amine oxide solution mat pump 132 of heat this inlet 114 of flowing through enters container 13, flows through the outside of element 11, dissolves gathering spinning solution in the above, be pumped as mentioned above then and leave container 13, by export 118 and valve 122 return storage tank 9.
Inlet 115 is connected to the opposite side of tube plate 12 by valve 117, and the effect of the amine oxide solution mat pump 132 of heat is through this inlet 115, and storage tank 9 is returned through exporting 118 again to its outside in element 11 inside of flowing through.This spinning solution that just makes the amine oxide solution of heat will accumulate in filter cell 11 inside dissolves, and flushing sees through the hole of its wall.
It is to carry out with not shown hot water jacket that amine oxide solution is heated to 110 ℃, and the water of mat heat exchanger 120 heating makes it circulate in this chuck with pump 136.
Return the amine oxide solution of storage tank 9 by 134 pumpings of container 13 mat pumps, can filter by a filter 123, be equipped with in this filter one be cleaned the element 11 that element 11 has same structure.Therefore, when filter 123 ran into obstruction, its also available mode as element 11 was cleaned.
The operating sequence of valve 116,117,122,127,128 is as follows.At first, valve the 117,127, the 128th bars up, and open valve 116 and 122 allows the amine oxide solution of heat charge into container 13, with molten the going of spinning solution of condensing on element 11 outer surfaces.The amine oxide solution of heat so circulated about 2 hours.Open valve 117 and 122 then, the amine oxide solution of the order heat screen cloth of flowing through from the inside of element 11, thereby molten the going of spinning solution in will manage are again through the tube wall of element.Amine oxide solution circulated 3 hours like this.Shut off valve 116 afterwards, and valve 117 still is held open state, make whole amine oxide solution pumpings by element 11, the amine oxide solution recirculation flow like this of heat 3 hours.
Stop pump 132, shut off valve 116 and 117, thus interrupt the supply of amine oxide solution to container 13.Shut off valve 122 then, and the solution mat pump 132 in the storage tank 9 is back in the storage tank (not shown) through valve 139 pumpings.
Then, open the valve 127 at import 125 places and the valve 128 at container 13 outlets 126 places, the demineralized water wash components 11 of order heat, water passes through container 13 by pump 133 pumpings.After washing with water, shut off valve 127 and 128, container 13 is opened in termination of pumping 133 then, so that element bundle 11 is taken out.
Get back to Fig. 1, the tube plate 12 of element 11 in Fig. 2 or equipment shown in Figure 3 taken off, be placed on the carriage (not shown).Then this carriage is inserted in the electrothermal vacuum stove 30.
Earlier stove 30 being evacuated to 26 inches (66 centimetres) mercury column of the about gauge pressure of pressure is 4 inches of absolute pressures (10 centimetres) mercury column, to prevent from still may be present in spinning solution remaining in the element or amine oxide oxidation and burning takes place when heating.Stove is warming up to 400-415 ℃ then, makes above-mentioned residue charing.The about 4-5 of this pyrolysis in element 11 hour.Then little air is fed in the stove 30, make pressure be adjusted to the about 13-20 inch of gauge pressure (33-50 centimetre) mercury column, make carbonaceous particle carry out oxidation and the burning of control is arranged.
After pyrolysis in stove 30 is got well, taking out element 11, insert during ultrasonic cleaning bathes, wherein is to be heated to 80 °-100 ℃ demineralized water.Ultrasonic water bath can make the charing particle shake pine in the filter cell 11.Make carbonized particles peel off with water under high pressure spray washing and filtering device element again.High pressure water washing and ultrasonic water bath are cleaned repeated several times optionally.
Element 11 is taken out from ultra sonic bath 31, put back in the vacuum drying oven 30 (or an a conventional oven), under atmospheric pressure, be heated to about 120 ℃ and kept 4 to 5 hours.This step is for those charing particles of still staying in the element after pyrolysis and bath-sonicated step are peeled off.This main effect that reheats step is not to carry out pyrolysis again.And this moment seldom or there is no the danger of spinning solution residue burning, so this step heating need not to carry out under the condition that vacuumizes.Experiment finds, this reheats step and peels off the chip that gets off and reach more than 10 grams for every element, and this is a no small amount comparatively speaking.Filter cell 11 is taken out stoves 30, put back in the hot water of ultrasonic water bath 31 and wash the chip flush away that will in reheating step, discharge.
Washed filter cell 11 is placed in the stove or an a conventional oven 32 that is used for pyrolysis then, under atmospheric pressure conditions, carries out drying.
From baking oven 32, take out the filter element cleaned, weigh, and the original weight when not staiing with its coming of new compares, all remove to confirm all chips.If weighing of element 11 shows to also have chip to remain in wherein, heating again, supersound washing, high pressure washing, dry this several steps can also repeat several times till all chips are all removed.Cleaned fully filter cell 11 just properly stores, and in order to being re-assembled on the tube plate 12, installing on the makers' spinning solution supply line of cellulose spinning again and goes.
Claims (10)
1. a method of cleaning spinning solution filter in the solvent spun fibre manufactory is characterized in that, this method comprises following each step:
(a) filter to be cleaned (10,11) is assembled in a container, make the hot solvent of solubilized spinning solution flow through filter, spinning solution is wherein dissolved and washing filter;
(b) with hot demineralized water washing filter (10,11), therefrom flush away solvent;
(c) hot filtration apparatus (10,11) residual spinning solution or temperature of solvent charing in be enough under vacuum condition with filter;
(d) supersound washing filter (10,11) in the demineralized water of heat is from wherein removing the charing particle;
(e) filter (10,11) is carried out drying.
2. the method for claim 1, it is characterized in that, in step (d) afterwards with filter (10,11) place a stove (30), reheat to a predetermined temperature, cooling makes the charing particle that may still residue in the filter peel off then, and supersound washing in demineralized water again makes the charing particle that peels off in the above-mentioned hot again step remove.
3. method as claimed in claim 1 or 2 is characterized in that this spinning solution is the aqueous solution of cellulose and amine oxide, and the solvent that is used for step a) is the amine oxide aqueous solution that is heated to 100 ° of 120 ℃ of temperature ranges.
4. the method for claim 1, it is characterized in that shilling solvent flows round the outside of filter (10,11), and then make it flow along a direction in filter interior, also can optionally make again at last its in filter along flowing in the opposite direction with last side.
5. the method for claim 1, it is characterized in that, the water that is used for step b) is to be heated to 100 °-120 ℃ temperature range, and/or filter (10,11) is heated to 400 °-415 ℃ temperature range in gauge pressure is the air of 33-66 centimetre of (13-26 inch) mercury column in step c).
6. method as claimed in claim 5, it is characterized in that, filter (10,11) earlier be evacuated to the temperature range that is heated to 400 °-415 ℃ in the stove that pressure is 66 centimetres of gauge pressures (26 inches) mercury column, in pressure is the air of gauge pressure 33-50 centimetre of (13-20 inch) mercury column, be heated to 400 °-415 ℃ temperature range then in a vacuum.
7. realize the equipment of the described method of claim 1, it is characterized in that, it comprises: one wherein is installed with filter (10 to be washed, 11) washing container (13), the solvent that order is used for step a) optionally flows through filter (10 at container, 11) device (9,32), device (127 with the demineralized water washing filter, 128,133), can put into filter and c set by step under reduced pressure) make filter residual spin liquid not burn and charing filter (10,11) is heated and the stove (30) of vacuum-pumping, carry out the ultrasonic water bath (31) of step d), and the drying device that carries out step e).
8. equipment as claimed in claim 7 is characterized in that, this equipment also comprises by reheating the heater that step reheats filter described in the claim 2.
9. equipment as claimed in claim 8 is characterized in that, described heater is a stove that is used for carrying out the vacuum-pumping of step c).
10. as the equipment of one of claim 7 to 9, it is characterized in that being used for the drying device that the step e) device for drying and filtering uses is a baking oven.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/069,039 US5372653A (en) | 1993-05-28 | 1993-05-28 | Cleaning of filters |
| US08/069,039 | 1993-05-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1124463A CN1124463A (en) | 1996-06-12 |
| CN1035470C true CN1035470C (en) | 1997-07-23 |
Family
ID=22086334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94192231A Expired - Lifetime CN1035470C (en) | 1993-05-28 | 1994-05-20 | Cleaning of filters |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US5372653A (en) |
| EP (1) | EP0700314B1 (en) |
| JP (1) | JPH08510410A (en) |
| CN (1) | CN1035470C (en) |
| AT (2) | ATE157899T1 (en) |
| AU (1) | AU6728994A (en) |
| BR (1) | BR9406643A (en) |
| CZ (1) | CZ314395A3 (en) |
| DE (1) | DE69405560T2 (en) |
| ES (1) | ES2108453T3 (en) |
| FI (1) | FI955741A0 (en) |
| SK (1) | SK148795A3 (en) |
| TR (1) | TR28376A (en) |
| TW (1) | TW262390B (en) |
| WO (1) | WO1994027707A1 (en) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2292098B (en) * | 1994-08-12 | 1998-04-29 | Kevin Miller | Cleaning of filters |
| US5977547A (en) * | 1998-01-21 | 1999-11-02 | Westington Savannah River Company | Filter for on-line air monitor unaffected by radon progeny and method of using same |
| US6221255B1 (en) | 1998-01-26 | 2001-04-24 | Achyut R. Vadoothker | Ultrasound-assisted filtration system |
| US6699400B1 (en) * | 1999-06-04 | 2004-03-02 | Arne W. Ballantine | Etch process and apparatus therefor |
| US6444133B1 (en) * | 2000-04-28 | 2002-09-03 | Corning Incorporated | Method of making photonic band gap fibers |
| EP1414763B1 (en) | 2001-07-06 | 2012-11-28 | Corning Incorporated | Method of making photonic band gap fibers |
| JP3884440B2 (en) * | 2004-03-15 | 2007-02-21 | 株式会社東芝 | Filter and semiconductor processing apparatus |
| TWI235425B (en) * | 2004-05-26 | 2005-07-01 | Promos Technologies Inc | Etching system and method for treating the etching solution thereof |
| CN100399518C (en) * | 2004-06-22 | 2008-07-02 | 茂德科技股份有限公司 | Etching system and treatment of etching agent |
| TWI273920B (en) * | 2004-09-24 | 2007-02-21 | Fujifilm Corp | Dope filtering method and solution casting method using the dope |
| US20080149594A1 (en) * | 2006-06-16 | 2008-06-26 | Packer Engineering, Inc. | Apparatus and process for forming and handling porous materials |
| JP5165427B2 (en) * | 2007-03-23 | 2013-03-21 | 富士フイルム株式会社 | Solution casting method |
| US9789520B2 (en) | 2010-06-22 | 2017-10-17 | Phillips 66 Company | Method for cleaning porous metallic filters using a steam-ultrasonic technique |
| CN102225269B (en) * | 2011-04-08 | 2013-07-03 | 王东伟 | Vacuum treating and deep cleaning method for stainless steel metal mesh |
| CN102940995A (en) * | 2012-11-09 | 2013-02-27 | 江阴市华宏化纤有限公司 | Filter element cleaning device |
| US9656197B2 (en) | 2012-11-12 | 2017-05-23 | Pall Corporation | Systems and methods for conditioning a filter assembly |
| US9421498B2 (en) | 2012-11-12 | 2016-08-23 | Pall Corporation | Systems and methods for conditioning a filter assembly |
| JP6083602B2 (en) * | 2013-03-29 | 2017-02-22 | 日本精線株式会社 | Method for producing precision metal filter for molten polymer |
| CA2867961A1 (en) * | 2013-10-16 | 2015-04-16 | Kenneth Hunter | System for evacuating contaminants from contaminant-trapping filters |
| CN106586570B (en) * | 2015-10-14 | 2019-11-15 | 中国石油化工股份有限公司 | Face the system and method that dust is unloaded under hydrogen environment |
| CN106635185A (en) * | 2016-11-24 | 2017-05-10 | 上海安赐环保科技股份有限公司 | System and technology for removing tar dust from coke oven gas |
| CA3014924A1 (en) * | 2017-08-21 | 2019-02-21 | Plasma Tech Holdings, Llc | Tailing pond remediation |
| CN111389103A (en) * | 2020-03-20 | 2020-07-10 | 首钢京唐钢铁联合有限责任公司 | Cleaning device and cleaning method for backwashing filter element |
| CN112391683B (en) * | 2020-11-06 | 2022-09-13 | 湖南东映碳材料科技有限公司 | Cleaning method of carbon fiber spinning assembly |
| CN114307395A (en) * | 2021-11-11 | 2022-04-12 | 荣成碳纤维科技有限公司 | Efficient cleaning method for special precision filter disc for polyacrylonitrile-based carbon fiber dry-jet wet spinning |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1031944A (en) * | 1987-09-13 | 1989-03-29 | Ltg航空技术股份有限公司 | Filter and method of operating thereof |
| CN2119262U (en) * | 1991-11-21 | 1992-10-21 | 辽源发电厂 | High-efficient fibre filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1044312A1 (en) * | 1981-12-11 | 1983-09-30 | Andreev Viktor N | Method of cleaning and regenerating filters |
| JPH0747101B2 (en) * | 1991-08-15 | 1995-05-24 | 丸善石油化学株式会社 | How to regenerate a clogged filter |
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1993
- 1993-05-28 US US08/069,039 patent/US5372653A/en not_active Expired - Fee Related
-
1994
- 1994-05-14 TW TW083104475A patent/TW262390B/zh active
- 1994-05-17 TR TR00494/94A patent/TR28376A/en unknown
- 1994-05-20 EP EP94915654A patent/EP0700314B1/en not_active Expired - Lifetime
- 1994-05-20 DE DE69405560T patent/DE69405560T2/en not_active Expired - Fee Related
- 1994-05-20 CN CN94192231A patent/CN1035470C/en not_active Expired - Lifetime
- 1994-05-20 AU AU67289/94A patent/AU6728994A/en not_active Abandoned
- 1994-05-20 CZ CZ953143A patent/CZ314395A3/en unknown
- 1994-05-20 SK SK1487-95A patent/SK148795A3/en unknown
- 1994-05-20 JP JP7500372A patent/JPH08510410A/en active Pending
- 1994-05-20 AT AT94915654T patent/ATE157899T1/en not_active IP Right Cessation
- 1994-05-20 ES ES94915654T patent/ES2108453T3/en not_active Expired - Lifetime
- 1994-05-20 BR BR9406643A patent/BR9406643A/en not_active Application Discontinuation
- 1994-05-20 WO PCT/GB1994/001109 patent/WO1994027707A1/en not_active Application Discontinuation
- 1994-05-20 AT AT0900894U patent/AT1123U1/en not_active IP Right Cessation
-
1995
- 1995-11-28 FI FI955741A patent/FI955741A0/en not_active Application Discontinuation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1031944A (en) * | 1987-09-13 | 1989-03-29 | Ltg航空技术股份有限公司 | Filter and method of operating thereof |
| CN2119262U (en) * | 1991-11-21 | 1992-10-21 | 辽源发电厂 | High-efficient fibre filter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1124463A (en) | 1996-06-12 |
| TW262390B (en) | 1995-11-11 |
| ATE157899T1 (en) | 1997-09-15 |
| TR28376A (en) | 1996-05-29 |
| FI955741A (en) | 1995-11-28 |
| FI955741A0 (en) | 1995-11-28 |
| DE69405560D1 (en) | 1997-10-16 |
| WO1994027707A1 (en) | 1994-12-08 |
| ES2108453T3 (en) | 1997-12-16 |
| CZ314395A3 (en) | 1996-06-12 |
| SK148795A3 (en) | 1996-09-04 |
| DE69405560T2 (en) | 1998-02-19 |
| JPH08510410A (en) | 1996-11-05 |
| US5372653A (en) | 1994-12-13 |
| EP0700314B1 (en) | 1997-09-10 |
| BR9406643A (en) | 1996-03-12 |
| EP0700314A1 (en) | 1996-03-13 |
| AT1123U1 (en) | 1996-11-25 |
| AU6728994A (en) | 1994-12-20 |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
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| ASS | Succession or assignment of patent right |
Owner name: LENZING AKTIENGESELLSCHAFT Free format text: FORMER OWNER: LENZING FIBERS LTD. Effective date: 20110517 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| C56 | Change in the name or address of the patentee |
Owner name: LENZING FIBERS LTD. Free format text: FORMER NAME: COURTAULDS FIBRES (HOLDINGS) LIMITED |
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Free format text: CORRECT: ADDRESS; FROM: NOTTINGHAM, THE UNITED KINGDOM TO: LENZING, AUSTRIA |
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| CP03 | Change of name, title or address |
Address after: British Nottingham Patentee after: Lion True Fiber Co.,Ltd. Address before: London, England Patentee before: COURTAULDS FIBRES (HOLDINGS) Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110517 Address after: Austria Jinge Patentee after: LENZING AG Address before: British Nottingham Patentee before: Lion True Fiber Co.,Ltd. |
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| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140520 Granted publication date: 19970723 |